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Why Eating a Low-Fat Diet Doesn?t Lead to Weight Loss

Posted Sep 16 2008 11:54pm

Is being heavy in your genes?

Not so fast.

Obesity genes account for only 5 percent of all weight problems.

But what about the other 95 percent of weight problems?

And why are we seeing such an epidemic of obesity in America today? It is the single most important public health issue facing us.

If genes do not account for obesity, is our high-fat diet to blame?

Wrong again!

But fat contains 9 calories per gram, so shouldn’t eating more fat (and more calories) make you gain weight?

Nothing could be further from the truth.

In fact, pioneering research by Harvard Medical School’s David Ludwig shows us the real reason that low-fat diets do not work -- and reveals the true cause of obesity for most Americans.

He correctly points out that careful review of all the studies on dietary fat and body fat -- such as those done by Dr. Walter Willett of the Harvard School of Public Health -- have shown that dietary fat is not a major determinant of body fat.

Let me repeat that.

==> Dietary fat is not a major determinant of body fat.

And that’s not all.

The Women’s Health Initiative, which is the largest clinical trial of diet and body weight, found that 50,000 women on low fat diets had no significant weight loss.

Another study looked at people who followed four different diets for 12 months -- and found no dramatic differences between those who followed low-fat, low-carb, and very- low-carb diets.

You’ve got to wonder: Why aren’t we seeing any significant effects from these various diets?

The main reason, Dr. Ludwig suggests, is that we are looking for answers in the wrong place.

==> The future of treating obesity and weight is in personalizing our approach.

This is the approach I wrote about in my book “UltraMetabolism.” It’s called nutrigenomics. It is the science of how we can use food to influence our genes and personalize our approach to health.

Let me explain how I diagnose and treat obesity.

Over the last 15 years, I have tested almost every one of my patients using a test that most doctors never use. In fact, it is even harder to find in the research, except in this pioneering work by Dr. Ludwig.

This test is cheap, easy to do, and it is probably the most important test for determining your overall health, the causes for obesity, and your risk of diabetes, heart disease, cancer, Alzheimer’s, and premature aging.

Yet it is a test your healthcare provider probably does not perform, does not know how to interpret, and often thinks is useless.

Thankfully, Dr. Ludwig’s research brings this critical method of diagnosing the cause of obesity and disease to the forefront.

You see, in two recent studies, he found that the main factor that determines changes in body weight and waist circumference (also known as belly fat) is how your body responds to any type of sugar, carbohydrate, or glucose load.

The most important test to determine this doesn’t measure your blood sugar or cholesterol.

It tests your insulin level.

You have to check it after drinking a sugary beverage that contains 75 grams of glucose.

This test has shown me more about my patients than any other test. It helps me personalize and customize a nutritional approach for them.

And its usefulness is now being borne out in this research by Dr. Ludwig and his colleagues.

In one study, for example, Dr. Ludwig and his colleagues followed 276 people for six years.

They performed a glucose tolerance test at the beginning of the study and looked at insulin concentrations 30 minutes after the people consumed a sugary drink. This gave the researchers a rough estimate of whether they were high- or low insulin secretors.

During the course of the study, they looked at the people’s body weight and waist circumference or belly fat.

They found that those who were the highest insulin secretors had the biggest change in weight and belly fat compared to the low insulin secretors. And people who were high insulin secretors and ate low-fat diets did even worse.

This makes perfect sense -- because insulin does two things:

  1. It stimulates hunger.
  2. It is a fat storage hormone, which makes you store belly fat.

So, after you eat a high-carbohydrate meal, your insulin spikes and your blood sugar plummets -- making you very hungry.

That is why you crave more carbs, more sugar, and eat more the whole day.

Dr. Ludwig also found that the patients who ate a low glycemic load diet -- which lowers blood sugar and keeps insulin levels low -- had much higher levels of HDL “good” cholesterol and much lower levels of triglycerides.

It appears that the best way to address your cholesterol is not necessarily to eat a low-fat diet, but to eat a low glycemic load diet, which keeps your blood sugar even.

I highly recommend reviewing Dr. Ludwig’s research on PubMed, the National Library of Medicine’s database, to learn more about his exciting and pioneering work.

I also encourage you to read his book, “Ending the Food Fight.” It is the first and only roadmap for dealing with our exploding childhood obesity epidemic.

Finally, I encourage you to ask your physician to do a glucose tolerance test and measure your insulin and blood sugar at 30 minutes, one hour, and two hours to get the best picture of your insulin profile.

If you are a high insulin secretor and your insulin goes over 30 at a half hour, one hour, or two hours, you produce too much insulin and need to be sure you are staying on a low glycemic load, whole-foods, unprocessed diet, which I describe in “UltraMetabolism”.

The bottom line?

If you want to fit into your jeans, you have to fit into your genes.

Now I’d like to hear from you…

What seems to trigger weight gain for you?

How have different diets worked for you?

Have you ever had you insulin and blood sugar tested?

Please let me know your thoughts by leaving a comment.

To your good health,

Mark Hyman, M.D.

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